Landing-chair for hoisting mechanisms.



No. 789.838. 7 PATENTED MAY 16, 1905. W. BURKART & H. A. WILLIAMS.LANDING OHAIR FOR HOISTING MEOHANISMS APPLICATION FILED MAY 14, 1904.

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- .Upiheivkikntmy M NITED STATES Patented May 16, 1905.

PATENT Orricn.

LANDING-CHAIR FOR HOISTING MECHANISMS.

SPECIFICATION forming part of Letters Patent No. 789,838, dated May 16,1905,

Application filed May 14, 1904. Serial No. 207,896.

To all whmn it may concern;

Beit known that we,WILLIAM BURKART and HARVEY A. WILLIAMS, citizens ofthe United States, residing at the city of Denver, in the county ofDenver and State of Colorado, have invented or discovered new and usefulImprovements in Landing-Chairs for Hoisting Mechanism, of which thefollowing is a specification.

In the'accompanying drawings, Figure 1 is a vertical section along theline 1 1 in Fig. 3, showing a mine-cage fitted with our improvedlanding-chair, the said invention being shown in its operative position.Fig. 2 is a partial side elevation of a cage looking toward the right ofFig. 3, showing the mechanism partially in dotted lines in its retractedor inoperative position; and Fig. 3 is an end view of the lower portionof said cage looking toward the left in Fig. 2, the angular section 16of bar 16 being broken away to show the teeth of the pinions 14 14:.

Our invention, generally speaking, consists of a new and improvedlanding-chair for mining-cages or hoisting devices in general; and moreparticularly it consists in the illustrated means normally retained in acontracted position within the line of the cage, but capable of beingextended at will outwardly to give a firm foundation for the hoistingdevice.

The mechanism is primarily intended as means for supporting a mine-cageover the mouth of a shaft while the same is being unloaded; but it isevident that it may readily be adapted to many kindred purposes.

The following is a detailed description of our invention as illustratedin the accompanying drawings.

1 is a mine-cage of any usual design and consists generally of a floor2, splash-boards 3 3, uprights 4 4, side plates 5 5, and hood 6. Thecageis suspended by means of cable 7, engaging clevis 8, which isconnected through hood 6.

9 9 are the usual shoes attached to the structure of the cage andadapted to slide on the vertical guides (not shown) fixed in the mineshaft.

10 10 are vertical plates, being preferably downwardly extendingprolongations of splash-boards 3 3 and of the general shape in dicatedin the drawings.

11 is a cross-shaft journaled at its ends in said plates 10 10.

12 is a horizontal plate connecting the lower edges of plates 10 10. 1313 are sections of I-beams between said plate 12 and the floor 2 of thecage intended to stiffen and strengthen the construction. Said I-beamsmay be perforated for the passage of shaft 11, so that they may extendon both sides of said shaft.

14 14 are pinions rigidly keyed or otherwise attached to shaft 11. 1

15 and 16 indicate pairs of slide-bars, one pair to each pinion, adaptedto engage, by means of their racks 17 17 the upper and lower sides,respectively, of the pinions 14 14. Said pinions are provided withflanges or shrouds 18 18 to retain the bars in alinement and engagementwith the teeth of said pinions. The upper slide-bar 15 is substantiallystraight and engages said pinion from above, as shown, while the otherbar, 16, to enable it to engage said pinion from below to receive motiontherefrom reverse to that given bar 15 we prefer to construct of twosubstantially horizontal sections 16 and 16 and anangularconmeeting-section 16 The rack 17 is on section 16 and engages thepinlon from beneath,

1 as shown.

' 19 19 are end plates, downwardly extending from floor 2 and providedwith perforations 20 20, through which the outer extremities of bars 15and 16 respectively protrude and slide.

The bars 15 and 16 are preferably provided with upwardly-tapered sides21 21 adjacent to their outer extremities to prevent clogging andbinding in the apertures 20 20.

22 is a rock-arm rigidly attached to shaft 11 and extending up through asuitable slot (not shown) in the floor of the cage. The upper end of arm22 is pivotally engaged by the inner end of hand-lever 23, which leverreciprocates in keeper 24, attached to one of the uprights 1 of thecage.

25 is a hand-grasp for the end of lever 23.

The parts are so assembled that when handlever 23 is shoved into theposition shown in Fig. 2 the arm 22 is forced over in the samedirection, thus rotating shaft 11 and pinions 1 1 14:. The rotation ofsaid pinions draws 1nwardly the bars 15 and 16 to the position shown insaid figure, the extremities of said bars resting in perforations 20 20.

As will be seen, the handle 23 and the extremities of bars 15 and 16 areso retracted that they do not protrude to catch on the sides of themine-shaft 26 as the cage is raised and lowered. When the cage hasreached the top of the shaft and is to be held stationary for unloadingor other purposes, the handle 23 is drawn out into the position shown inFig. 1, drawing over the arm 22 and rotating shaft 11, thus rotating thepinions 14 14 in the reverse manner from that above described. By thismeans the bars 15 and 16 are forced outwardly, so that they protrudebeyond the side of the shaft and rest upon the floor of the shaft-house27. The cage now rests on said bars and is firmly and securely supportedwhile the cage is being unloaded. When it is desired to lower the cage,the lever 23 is pushed inwardly, thus reversing the operation lastdescribed and retracting the bars 15 and 16 into the position shown inFig. 2, this permitting the cage to be lowered without interference.

It is evident from the above that we have produced a very reliable andefficient landingchair for the use described; but it is evident that byslight modifications, which would present themselves readily to thoseskilled in the art, our invention could be used for many kindredpurposes, such as a safety device to prevent the cage from falling inthe shaft, the bars being arranged to catch the sides of the shaft orsuitable recesses provided therein and lock the cage in astationaryposition. It is evident that any number of pinions may besupplied to a cage or other hoist, each with its pair of chair-bars, or,if desired, each chairbar may have its individual controlling-pinion;but we prefer the construction shown as simple and strong.

We have shown the mechanism applied to avertical shaft-mine; but it isevident that our invention may be applied to a hoist of any characteroperated in a slope, the direction of the movement of the chair-armsbeing preferably modified to be at substantially right 7 angles to themovement of the hoist. The in- I vention is not only adapted to use inmining operations, but may be used with advantage in any case wherehoisting is carried on either vertically or otherwise.

Although for the sake of clearness we have described the specificmechanism shown in the drawings, we do not wish to limit ourselvesthereby; but

WVe claim- 1. In hoisting mechanism, a hoist having a slot in each endthereof, a shaft secured to said hoist, a lever secured to said shaft, apinion secured to said shaft having a shroud on each side thereof, saidshrouds extending radially beyond the teeth of said pinion and racked,slidable chair-bars adapted to be operated by said pinion and extendingthrough said slots.

2. In hoisting mechanism, a hoist having a substantially rectangularslot in each end thereof, a shaft secured to said hoist, a pinionsecured to said shaft having a shroud on each side thereof, said shroudsextending radially beyond the teeth of said pinion and slidablechair-bars adapted for the purpose described extending through theslotted ends of said hoist.

3. In hoisting mechanism, a hoist, plates downwardly extending from eachside of said hoist, a transverse plate connecting the lower extremitiesof said side plates, a shaft journaled in said side plates havingpinions secured thereto, an intermediate support between said pinionsconnecting said transverse plate and said hoist and chair-bars adaptedto be operated by said pinion as and for the purpose described.

Signed at Denver, Colorado, this 7th day of May, 1904.

WILLIAM BURKART. HARVEY A. WILLIAMS. Witnesses:

M. W. BARRETT, WM. L. DAYTON.

